Rong Zhou, Søren Ugilt Larsen & Mai-Britt Brøndum
English description of task 2 and 5 that AU-FOOD was involved
2. Fertilizer efficacy test and uptake of nutrients N, P and K in the compost product
The fertilizer effect of the compost product is tested in cultivation experiments in pots in greenhouses at AU-FOOD in Skejby. The compost product is analyzed for the content of the most important plant nutrients and, depending on the nutrient composition of the compost product, the experiments will focus primarily on the macronutrients N, P and K. In the cultivation experiments, plant growth is measured in terms of plant height, fresh weight and dry weight per plant and nutrient uptake at the end of the experiment, and possibly other relevant quality parameters are considered. In the experiments, the three compost products are tested (possibly in two doses) and compared with a number of references with different levels of the selected nutrient added as commercial fertilizer, which will be used to generate a dose-response curve. From the dose-response curve, the relative fertilizer effect of the compost product is calculated compared to fertilization with the nutrient from commercial fertilizer.
NOTE: It must be clarified which plant species the test is to be carried out with and if two plant species can be used. This is clarified between AU, TI and Bacess.
Responsible: AU and TI (Bioresources and Biorefining). The trial is planned jointly between AU and TI. AU is responsible for establishing, fertilizing and irrigating the trial and assisting in the assessment. TI assists in establishing and assessing the trial and for doing statistical analysis of the results.
Approximate budget: 164,000 DKR (94,000 for AU + 80,000 DKR for TI)
5. Water-holding capacity of growth substrates amended with compost product
The water-holding capacity of the three compost products is tested by incorporating a certain proportion of compost into another growth substrate such as sphagnum peat or the like, at doses similar to those used in cultivation experiments under point 2. As a reference, another growth substrate is used without amendment with compost. Water holding capacity is measured by measuring the total water content at full irrigation, after drainage to 'pot capacity' and after complete drying. This is supplemented by measuring water potential (tension) to obtain a retention curve and knowledge of how much plant-available water the product/substrate mixture can contain at different water potentials.
Approximate budget: 52,000 DKR
Projekt period: 2021 Jan-2022 Dec
Finansing: whole budget, 986,000 DKK (146,000 DKK for au)
Collaborators: company Bacess A/S, DTI
Participants (bot AU an external people): Rong Zhou, Søren Ugilt Larsen <firstname.lastname@example.org> and Mai-Britt Brøndum <email@example.com>
01/01-2021 → 31/12-2022